Lielupe near Mežotne
|Mouth||Gulf of Riga at Vakarbuļļi|
|Basin countries||Latvia, Lithuania|
|Length||119 kilometres (74 mi)|
|Avg. discharge||3,54 km³|
|Basin area||17,600 km2 (6,800 sq mi) (In Latvia:8800 km²)|
The Lielupe (in Latvian literally: Large River, German: Kurländische Aa) is a river in central Latvia. Its length is 119 km (the length would reach 310 km if the Mēmele River were counted as part of the Lielupe). The surface area of its basin is 17,600 km². The average fall of the Lielupe is about (.1 meter/kilometer) and its average volume is 106 m³/s, although 1380 m³/s is the maximum during floods.
The Lielupe begins at the confluence of the Mēmele and Mūsa rivers near Bauska. For the upper part of its course, the river flows through a dolomite valley with a few small rapids, until it reaches Mežotne, where it widens and deepens over the flat Zemgale Plain. For many years the Lielupe would frequently overflow its shallow banks and flood surrounding fields and villages, particularly during the spring thaw. Today many parts of the Lielupe's banks are contained with earthen dikes to prevent disastrous floods. Much of the Lielupe is covered in river grasses. At its lower reaches, the river flows parallel to the coast line of the Gulf of Riga; the city of Jūrmala stretches for almost 30 km between the river and the sea. Eventually the Lielupe flows into the Baltic Sea, while the Buļļupe branch (German: Kurische Aa) flows into the Daugava River. The modern mouth of the river appeared in 1755. Before then the Buļļupe was the Lielupe's main channel.
About 50-55% of the water discharge of the river is from melted snow. The Lielupe is navigable for a range of 100 km, the longest continuous range among Latvian rivers. Municipalities along the river include Bauska, Mežotne, Jelgava, Kalnciems, Jūrmala and Riga.
Lielupe is also the name of a railway station and a neighbourhood in Jūrmala.
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